aboutsummaryrefslogtreecommitdiff
path: root/target-arm
diff options
context:
space:
mode:
Diffstat (limited to 'target-arm')
-rw-r--r--target-arm/cpu.h12
-rw-r--r--target-arm/helper.c250
2 files changed, 218 insertions, 44 deletions
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 09083b723a..4723807626 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -83,10 +83,14 @@ typedef struct CPUARMState {
uint32_t c0_cachetype;
uint32_t c1_sys; /* System control register. */
uint32_t c1_coproc; /* Coprocessor access register. */
- uint32_t c2; /* MMU translation table base. */
- uint32_t c3; /* MMU domain access control register. */
+ uint32_t c2_base; /* MMU translation table base. */
+ uint32_t c2_data; /* MPU data cachable bits. */
+ uint32_t c2_insn; /* MPU instruction cachable bits. */
+ uint32_t c3; /* MMU domain access control register
+ MPU write buffer control. */
uint32_t c5_insn; /* Fault status registers. */
uint32_t c5_data;
+ uint32_t c6_region[8]; /* MPU base/size registers. */
uint32_t c6_insn; /* Fault address registers. */
uint32_t c6_data;
uint32_t c9_insn; /* Cache lockdown registers. */
@@ -241,7 +245,8 @@ enum arm_features {
ARM_FEATURE_VFP,
ARM_FEATURE_AUXCR, /* ARM1026 Auxiliary control register. */
ARM_FEATURE_XSCALE, /* Intel XScale extensions. */
- ARM_FEATURE_IWMMXT /* Intel iwMMXt extension. */
+ ARM_FEATURE_IWMMXT, /* Intel iwMMXt extension. */
+ ARM_FEATURE_MPU /* Only has Memory Protection Unit, not full MMU. */
};
static inline int arm_feature(CPUARMState *env, int feature)
@@ -258,6 +263,7 @@ void cpu_arm_set_cp_io(CPUARMState *env, int cpnum,
#define ARM_CPUID_ARM1026 0x4106a262
#define ARM_CPUID_ARM926 0x41069265
+#define ARM_CPUID_ARM946 0x41059461
#define ARM_CPUID_PXA250 0x69052100
#define ARM_CPUID_PXA255 0x69052d00
#define ARM_CPUID_PXA260 0x69052903
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 8526883fb6..e8a2169759 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -19,6 +19,10 @@ static void cpu_reset_model_id(CPUARMState *env, uint32_t id)
env->vfp.xregs[ARM_VFP_FPSID] = 0x41011090;
env->cp15.c0_cachetype = 0x1dd20d2;
break;
+ case ARM_CPUID_ARM946:
+ set_feature(env, ARM_FEATURE_MPU);
+ env->cp15.c0_cachetype = 0x0f004006;
+ break;
case ARM_CPUID_ARM1026:
set_feature(env, ARM_FEATURE_VFP);
set_feature(env, ARM_FEATURE_AUXCR);
@@ -90,6 +94,7 @@ struct arm_cpu_t {
static const struct arm_cpu_t arm_cpu_names[] = {
{ ARM_CPUID_ARM926, "arm926"},
+ { ARM_CPUID_ARM946, "arm946"},
{ ARM_CPUID_ARM1026, "arm1026"},
{ ARM_CPUID_PXA250, "pxa250" },
{ ARM_CPUID_PXA255, "pxa255" },
@@ -392,13 +397,67 @@ static int get_phys_addr(CPUState *env, uint32_t address, int access_type,
address += env->cp15.c13_fcse;
if ((env->cp15.c1_sys & 1) == 0) {
- /* MMU diusabled. */
+ /* MMU/MPU disabled. */
*phys_ptr = address;
*prot = PAGE_READ | PAGE_WRITE;
+ } else if (arm_feature(env, ARM_FEATURE_MPU)) {
+ int n;
+ uint32_t mask;
+ uint32_t base;
+
+ *phys_ptr = address;
+ for (n = 7; n >= 0; n--) {
+ base = env->cp15.c6_region[n];
+ if ((base & 1) == 0)
+ continue;
+ mask = 1 << ((base >> 1) & 0x1f);
+ /* Keep this shift separate from the above to avoid an
+ (undefined) << 32. */
+ mask = (mask << 1) - 1;
+ if (((base ^ address) & ~mask) == 0)
+ break;
+ }
+ if (n < 0)
+ return 2;
+
+ if (access_type == 2) {
+ mask = env->cp15.c5_insn;
+ } else {
+ mask = env->cp15.c5_data;
+ }
+ mask = (mask >> (n * 4)) & 0xf;
+ switch (mask) {
+ case 0:
+ return 1;
+ case 1:
+ if (is_user)
+ return 1;
+ *prot = PAGE_READ | PAGE_WRITE;
+ break;
+ case 2:
+ *prot = PAGE_READ;
+ if (!is_user)
+ *prot |= PAGE_WRITE;
+ break;
+ case 3:
+ *prot = PAGE_READ | PAGE_WRITE;
+ break;
+ case 5:
+ if (is_user)
+ return 1;
+ *prot = PAGE_READ;
+ break;
+ case 6:
+ *prot = PAGE_READ;
+ break;
+ default:
+ /* Bad permission. */
+ return 1;
+ }
} else {
/* Pagetable walk. */
/* Lookup l1 descriptor. */
- table = (env->cp15.c2 & 0xffffc000) | ((address >> 18) & 0x3ffc);
+ table = (env->cp15.c2_base & 0xffffc000) | ((address >> 18) & 0x3ffc);
desc = ldl_phys(table);
type = (desc & 3);
domain = (env->cp15.c3 >> ((desc >> 4) & 0x1e)) & 3;
@@ -539,18 +598,50 @@ uint32_t helper_get_cp(CPUState *env, uint32_t insn)
return 0;
}
+/* Return basic MPU access permission bits. */
+static uint32_t simple_mpu_ap_bits(uint32_t val)
+{
+ uint32_t ret;
+ uint32_t mask;
+ int i;
+ ret = 0;
+ mask = 3;
+ for (i = 0; i < 16; i += 2) {
+ ret |= (val >> i) & mask;
+ mask <<= 2;
+ }
+ return ret;
+}
+
+/* Pad basic MPU access permission bits to extended format. */
+static uint32_t extended_mpu_ap_bits(uint32_t val)
+{
+ uint32_t ret;
+ uint32_t mask;
+ int i;
+ ret = 0;
+ mask = 3;
+ for (i = 0; i < 16; i += 2) {
+ ret |= (val & mask) << i;
+ mask <<= 2;
+ }
+ return ret;
+}
+
void helper_set_cp15(CPUState *env, uint32_t insn, uint32_t val)
{
uint32_t op2;
+ uint32_t crm;
op2 = (insn >> 5) & 7;
+ crm = insn & 0xf;
switch ((insn >> 16) & 0xf) {
case 0: /* ID codes. */
goto bad_reg;
case 1: /* System configuration. */
switch (op2) {
case 0:
- if (!arm_feature(env, ARM_FEATURE_XSCALE) || (insn & 0xf) == 0)
+ if (!arm_feature(env, ARM_FEATURE_XSCALE) || crm == 0)
env->cp15.c1_sys = val;
/* ??? Lots of these bits are not implemented. */
/* This may enable/disable the MMU, so do a TLB flush. */
@@ -571,38 +662,71 @@ void helper_set_cp15(CPUState *env, uint32_t insn, uint32_t val)
goto bad_reg;
}
break;
- case 2: /* MMU Page table control. */
- env->cp15.c2 = val;
+ case 2: /* MMU Page table control / MPU cache control. */
+ if (arm_feature(env, ARM_FEATURE_MPU)) {
+ switch (op2) {
+ case 0:
+ env->cp15.c2_data = val;
+ break;
+ case 1:
+ env->cp15.c2_insn = val;
+ break;
+ default:
+ goto bad_reg;
+ }
+ } else {
+ env->cp15.c2_base = val;
+ }
break;
- case 3: /* MMU Domain access control. */
+ case 3: /* MMU Domain access control / MPU write buffer control. */
env->cp15.c3 = val;
break;
case 4: /* Reserved. */
goto bad_reg;
- case 5: /* MMU Fault status. */
+ case 5: /* MMU Fault status / MPU access permission. */
switch (op2) {
case 0:
+ if (arm_feature(env, ARM_FEATURE_MPU))
+ val = extended_mpu_ap_bits(val);
env->cp15.c5_data = val;
break;
case 1:
+ if (arm_feature(env, ARM_FEATURE_MPU))
+ val = extended_mpu_ap_bits(val);
env->cp15.c5_insn = val;
break;
- default:
- goto bad_reg;
- }
- break;
- case 6: /* MMU Fault address. */
- switch (op2) {
- case 0:
- env->cp15.c6_data = val;
+ case 2:
+ if (!arm_feature(env, ARM_FEATURE_MPU))
+ goto bad_reg;
+ env->cp15.c5_data = val;
break;
- case 1:
- env->cp15.c6_insn = val;
+ case 3:
+ if (!arm_feature(env, ARM_FEATURE_MPU))
+ goto bad_reg;
+ env->cp15.c5_insn = val;
break;
default:
goto bad_reg;
}
break;
+ case 6: /* MMU Fault address / MPU base/size. */
+ if (arm_feature(env, ARM_FEATURE_MPU)) {
+ if (crm >= 8)
+ goto bad_reg;
+ env->cp15.c6_region[crm] = val;
+ } else {
+ switch (op2) {
+ case 0:
+ env->cp15.c6_data = val;
+ break;
+ case 1:
+ env->cp15.c6_insn = val;
+ break;
+ default:
+ goto bad_reg;
+ }
+ }
+ break;
case 7: /* Cache control. */
/* No cache, so nothing to do. */
break;
@@ -629,14 +753,23 @@ void helper_set_cp15(CPUState *env, uint32_t insn, uint32_t val)
goto bad_reg;
}
break;
- case 9: /* Cache lockdown. */
- switch (op2) {
- case 0:
- env->cp15.c9_data = val;
- break;
- case 1:
- env->cp15.c9_insn = val;
+ case 9:
+ switch (crm) {
+ case 0: /* Cache lockdown. */
+ switch (op2) {
+ case 0:
+ env->cp15.c9_data = val;
+ break;
+ case 1:
+ env->cp15.c9_insn = val;
+ break;
+ default:
+ goto bad_reg;
+ }
break;
+ case 1: /* TCM memory region registers. */
+ /* Not implemented. */
+ goto bad_reg;
default:
goto bad_reg;
}
@@ -644,12 +777,13 @@ void helper_set_cp15(CPUState *env, uint32_t insn, uint32_t val)
case 10: /* MMU TLB lockdown. */
/* ??? TLB lockdown not implemented. */
break;
- case 11: /* TCM DMA control. */
case 12: /* Reserved. */
goto bad_reg;
case 13: /* Process ID. */
switch (op2) {
case 0:
+ if (!arm_feature(env, ARM_FEATURE_MPU))
+ goto bad_reg;
/* Unlike real hardware the qemu TLB uses virtual addresses,
not modified virtual addresses, so this causes a TLB flush.
*/
@@ -659,7 +793,8 @@ void helper_set_cp15(CPUState *env, uint32_t insn, uint32_t val)
break;
case 1:
/* This changes the ASID, so do a TLB flush. */
- if (env->cp15.c13_context != val)
+ if (env->cp15.c13_context != val
+ && !arm_feature(env, ARM_FEATURE_MPU))
tlb_flush(env, 0);
env->cp15.c13_context = val;
break;
@@ -671,7 +806,7 @@ void helper_set_cp15(CPUState *env, uint32_t insn, uint32_t val)
goto bad_reg;
case 15: /* Implementation specific. */
if (arm_feature(env, ARM_FEATURE_XSCALE)) {
- if (op2 == 0 && (insn & 0xf) == 1) {
+ if (op2 == 0 && crm == 1) {
/* Changes cp0 to cp13 behavior, so needs a TB flush. */
tb_flush(env);
env->cp15.c15_cpar = (val & 0x3fff) | 2;
@@ -717,31 +852,64 @@ uint32_t helper_get_cp15(CPUState *env, uint32_t insn)
default:
goto bad_reg;
}
- case 2: /* MMU Page table control. */
- return env->cp15.c2;
- case 3: /* MMU Domain access control. */
+ case 2: /* MMU Page table control / MPU cache control. */
+ if (arm_feature(env, ARM_FEATURE_MPU)) {
+ switch (op2) {
+ case 0:
+ return env->cp15.c2_data;
+ break;
+ case 1:
+ return env->cp15.c2_insn;
+ break;
+ default:
+ goto bad_reg;
+ }
+ } else {
+ return env->cp15.c2_base;
+ }
+ case 3: /* MMU Domain access control / MPU write buffer control. */
return env->cp15.c3;
case 4: /* Reserved. */
goto bad_reg;
- case 5: /* MMU Fault status. */
+ case 5: /* MMU Fault status / MPU access permission. */
switch (op2) {
case 0:
+ if (arm_feature(env, ARM_FEATURE_MPU))
+ return simple_mpu_ap_bits(env->cp15.c5_data);
return env->cp15.c5_data;
case 1:
+ if (arm_feature(env, ARM_FEATURE_MPU))
+ return simple_mpu_ap_bits(env->cp15.c5_data);
+ return env->cp15.c5_insn;
+ case 2:
+ if (!arm_feature(env, ARM_FEATURE_MPU))
+ goto bad_reg;
+ return env->cp15.c5_data;
+ case 3:
+ if (!arm_feature(env, ARM_FEATURE_MPU))
+ goto bad_reg;
return env->cp15.c5_insn;
default:
goto bad_reg;
}
- case 6: /* MMU Fault address. */
- switch (op2) {
- case 0:
- return env->cp15.c6_data;
- case 1:
- /* Arm9 doesn't have an IFAR, but implementing it anyway shouldn't
- do any harm. */
- return env->cp15.c6_insn;
- default:
- goto bad_reg;
+ case 6: /* MMU Fault address / MPU base/size. */
+ if (arm_feature(env, ARM_FEATURE_MPU)) {
+ int n;
+ n = (insn & 0xf);
+ if (n >= 8)
+ goto bad_reg;
+ return env->cp15.c6_region[n];
+ } else {
+ switch (op2) {
+ case 0:
+ return env->cp15.c6_data;
+ case 1:
+ /* Arm9 doesn't have an IFAR, but implementing it anyway
+ shouldn't do any harm. */
+ return env->cp15.c6_insn;
+ default:
+ goto bad_reg;
+ }
}
case 7: /* Cache control. */
/* ??? This is for test, clean and invaidate operations that set the
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-18 01:30:57 +0000